library/roles/drupal-org/defaults/main.yml: Fix the php packages list.

drupal-org/defaults/main.yml

@@ -9,17 +9,19 @@ drupal_php_user: drupal
 drupal_download_dir: /srv/drupal
 drupal_install_dir: /var/www
 
+# If you use the PHP ppa to install php 5.6, also install those packages:
+#
+#  - 'php{{ php_version }}-xml'
+#  - 'php{{ php_version }}-mbstring'
+#  - php-ssh2
 drupal_php_prereq:
   - 'php{{ php_version }}-json'
   - 'php{{ php_version }}-intl'
   - 'php{{ php_version }}-cli'
   - 'php{{ php_version }}-mysqlnd'
   - 'php{{ php_version }}-gd'
-  - 'php{{ php_version }}-xml'
   - 'php{{ php_version }}-json'
   - 'php{{ php_version }}-curl'
-  - 'php{{ php_version }}-mbstring'
-  - php-ssh2
   - php-apc
   - php-pear
   - php-date